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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Array includes() — NaN</title>
</head>
<body>
  <h1>includes() — NaN</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var values = [1, NaN, 3];
      document.getElementById("out").textContent =
        String(values.includes(NaN)) + "\n" +
        String(values.indexOf(NaN));
    })();
  </script>
</body>
</html>

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JavaScript Array includes() — NaN (Try It)